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What is the significance of RTS and CTS packets?
RTS/CTS is an additional method to implement virtual carrier sensing in carrier sense multiple access with collision avoidance (CSMA/CA). By default, 802.11 relies on physical carrier sensing only, which is known to suffer from the hidden node problem. The RTS/CTS packet size threshold is 0–2347 octets.
Why does implementing RTS CTS help speed up data transmission?
RTS/CTS Settings The use of 802.11 RTS/CTS can increase the reliability of 802.11 data frame transmissions in the presence of hidden nodes, which improves the throughput of the network. Because RTS/CTS introduces overhead, disable it if you find a drop in throughput, even if you have fewer collisions.
Is RTS an output?
RTS is an output. Asserted is 0V or low. Deasserted is 3.3V or high.
What is the best fragmentation threshold?
This is called the fragmentation threshold. This setting is rarely changed. The default setting is the maximum frame size of 2346, which means that it will never fragment any frames that it sends to wireless clients. This is best for most environments.
What are the problems with RTS / CTS frames?
Frame Format. The RTS/CTS frames can cause a new problem called the exposed terminal problem in which a wireless node that is nearby, but is associated with another access point overhears the exchange and then is signaled to backoff and cease transmitting for the time specified in the RTS.
When does the RTS and CTS handshake occur?
Typically, sending RTS/CTS frames does not occur unless the packet size exceeds this threshold. If the packet size that the node wants to transmit is larger than the threshold, the RTS/CTS handshake gets triggered. Otherwise, the data frame gets sent immediately.
How is the duration of RTS / CTS calculated?
Here is the Acknowledgement frame send to the client (iPhone5) to confirming the data frame received by AP. ACK is 14 byte long frame & duration always set to 0. Below diagram (figure 9.4 IEEE-802.11-2012 std )summarize the RTS/CTS frame exchange & how each of them duration value is calculated.
What is the packet size threshold for RTS / CTS?
RTS/CTS packet size threshold is 0–2347 octets. Typically, sending RTS/CTS frames does not occur unless the packet size exceeds this threshold. If the packet size that the node wants to transmit is larger than the threshold, the RTS/CTS handshake gets triggered. Otherwise, the data frame gets sent immediately.